3. A rectangular lawn measures 50 feet by 25 feet and has three flower beds. One of the beds is circular with an 8 foot diameter, one is a 7 foot square and the third is rectangular with a width 9 feet and a length that is 3 times its width.
a. If a bag of mulch covers 90 square feet, how many bags are required to cover the flower beds?
b. It is desired to put a fence around each of the mulched areas. How many feet of fence are required?
c. What is the area of the lawn not covered by mulch?
d. If a bag of lawn seed covers 100 square feet, how many are needed to cover the area not covered by mulch?